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Mitosis
Onions have larger chromosomes than most plants and they stain dark.
The chromosomes are easily observed through a compound light microscope.
The apical meristem is an area of a plant where cell division takes place at a rapid rate.
Why Onions?
Stages of MitosisThe numbers to the left correspond to the numbered pictures on the right. For example
picture 1 is a cell in interphase.
1 interphase2 Beginning of prophase3 early prophase4 mid prophase5 late prophase6 metaphase 7 early anaphase8 anaphase9 telophase10 cytokinesis
Interphase
The highlighted area shows a cell in interphase. Draw this cell in the space provided.
-The cell is growing in size
- The cell is replicating its DNA in preparation for division.
-The nucleus is apparent.
Prophase
The highlighted area shows a cell in prophase. Draw this cell in the space provided.
-the nuclear envelope starts to break down
-all the chromosomes start to coil up in the center of the cell.
-nucleoli disappear
Metaphase
The highlighted area shows a cell in metaphase. Draw this cell in the space provided.
-the chromosome pairs line up in the center of the cell along spindle fibers that pull to either side of the cell.
Anaphase
The highlighted area shows a cell in anaphase. Draw this cell in the space provided.
• The spindle fibers become shorter and pull each chromosome pair apart to the opposite ends of the cell.
TelophaseThe highlighted area shows a
cell in telophase. Draw this cell in the space provided.
• The final stage of cell replication.
• The nuclear envelope and nucleoli are reformed.
Resources
• http://www.microscopy-uk.org.uk/mag/artnov04macro/jronionroot.html• http://www.vcbio.science.ru.nl/en/image-gallery/show/PL0096/labels/
• http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/cell_division/onion_review_fs.html
• White Fish Cell Mitosis Pictures: http://www.linkpublishing.com/video-mitosis.htm#MITOSIS_-_WHITEFISH_BLASTULA
• White Fish Mitosis Cells Pic: http://www.flickr.com/photos/10517539@N07/1554957435/
• Mitosis World: http://www.bio.unc.edu/faculty/salmon/lab/mitosis/mitosislinks.html
• www.cellsalive.com